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Configuring ATM-Frame Relay Service Interworking

Contents

Introduction

This document is an example of setting up ATM - Frame Relay Service InterWorking (SIW) between Cisco routers and Cisco/StrataCom WAN switches. For more detail on configuring traffic shaping on Cisco routers, refer to the Related Information section.

For more detail on configuring components, please see the reference manuals as well as the Designing ATM Internetworks in the Internetwork Design Guide.

Configuring the MGX 8220 Shelf

  1. Verify that the line exists. 
    
 rtp-ax1.1.9.FRSM.a > dsplns

 Line  Conn   Type     Status/Coding Length  XmtClock Alarm Stats
       Type                                   Source    Alarm                            
 ---- -----   ----     ------------- ------- --------  

 9.1   DB-15  dsx1ESF  Dis/dsx1B8ZS 0-110 ft LocalTim           

 9.2   DB-15  dsx1ESF  Dis/dsx1B8ZS 0-110 ft LocalTim           

 9.3   DB-15  dsx1ESF  Dis/dsx1B8ZS 0-110 ft LocalTim           

 9.4   DB-15  dsx1ESF  Dis/dsx1B8ZS 0-110 ft LocalTim           


 LineNumOfValidEntries: 4


 Syntax : dsplns

  2. Enable the line. 
    
 rtp-ax1.1.9.FRSM.a > addln 1

 rtp-ax1.1.9.FRSM.a >

    If this works, you will only get the prompt back. However, you can make sure that the status is enabled by typing in dsplns again. 

    
 Line  Conn  Type  Status/Coding Length  XmtClock Alarm Stats
       Type                               Source    Alarm   

 ---- ------ ----  ------------- ------  --------   

 9.1  DB-15 dsx1ESF Ena/dsx1B8ZS 0-110 ft LocalTim           

 9.2  DB-15 dsx1ESF Dis/dsx1B8ZS 0-110 ft LocalTim           

 9.3  DB-15 dsx1ESF Dis/dsx1B8ZS 0-110 ft LocalTim           

 9.4  DB-15 dsx1ESF Dis/dsx1B8ZS 0-110 ft LocalTim           


  LineNumOfValidEntries: 4


  Syntax : dsplns



  rtp-ax1.1.9.FRSM.a >
  3. Add the logical port configuration.

    The following sets up a 256K port between the 3640 and the MGX 8220 shelf with a port type of frame relay. 

       
 rtp-ax1.1.9.FRSM.a > addport 1 1 2 1 4 1
 
 rtp-ax1.1.9.FRSM.a >
    Then configure the port to use LMI signaling, in this example we are using StrataLmi with async updates. 
    
 rtp-ax1.1.9.FRSM.a > cnfport 1 s y 
 
 rtp-ax1.1.9.FRSM.a >
    Verify that the port has been added and the configuration is correct. 
       
 Port Ena/Speed EQServ SignalType T391 T392 N391 N392 N393  Type    Alarm
          Ratio 
 ---- --- ----- ------ ---------- ---- ---- ---- ---- ---- -------- -----
 9.1.1 Mod/ 256k  1    StrataLMI   10   15   6    3    4   frameRel  Yes

 Number of ports:              1

 PortDs0UsedLine1:             0x0000000f

 PortDs0UsedLine2:             0x00000000

 PortDs0UsedLine3:             0x00000000

 PortDs0UsedLine4:             0x00000000

 PortNumNextAvailable:         96
 
 
 Syntax : dspports

  4. Now you are ready to add the data-link connection identifier (DLCI) and ATM internetworking. Remember that the actual internetworking conversion from RFC 1490 (Frame Relay side) to RFC 1483 (ATM side) is done on the MGX 8220 shelf. (See Obtaining RFCs and Other Standards Documents for more information about these and other RFCs.)

    The example below depicts adding a connection using logical channel number 40 on logical port 1 (timeslots 1-4) configured with DLCI 100 with a CIR of 128 using protocol SNAP translation (SIW-xlation). 

     rtp-ax1.1.9.FRSM.a > addchan 40 1 100 128 3

 SAR-MSG>>LCN 40 is enabled
  
 rtp-ax1.1.9.FRSM.a > 

 rtp-ax1.1.9.FRSM.a > dspchans
    Verify the channel. 
    
 DLCI    Chan EQ   I/EQDepth   I/EQDEThre  I/EECNThre  Fst/ DE  Type  Alarm
 ----    ---- --  -----------  ----------  ---------- 

9.1.1.100  40  2  65535/65535  32767/32767  6553/6553  Dis/Dis  SIW-x  Yes 

 
 Number of channels:    1
 
 ChanNumNextAvailable:  31

 
 Syntax : dspchans

Configuring the BPX

  1. Make sure that the ATM Service Interface (ASI) port is up and active.

    Up the line: 

     upln 5.1

    Up the port: 

     upport 5.1

  2. Add the shelf to the network.

    Up the trunk on the BNI port 1.1: 

     uptrk 1.1

    Add the MGX 8220 shelf connected to 1.1: 

     addshelf 1.1 A

  3. Verify that the MGX 8220 shelf exists on the network. Use the command dspnode to see the MGX 8220 shelf listed.

  4. Add the connection from the ASI (port 5.1) the Broadband Network Interface (BNI) (1.1) where the MGX 8220 shelf is located using the slot number (9) and channel number (40) configured in the MGX 8220 section above. Please note that the connection class must be ATFR (ATM-Frame Relay). 
     addcon 5.1.1.32 rtp-bpx1 1.1.9.40 ATFR 600 * * * * 300 * * * * * e n *

Configuring the ATM-Attached Router (Cisco 4700)

The following is the required configuration for the ATM-attached router with a minimum of 1 PVC. 
 int atm 0.1  
 ip address 10.20.1.3 255.255.255.0 
 ATM pvc 1 1 32 aal5snap 
 map-group sample1 

   ....


 map-list sample1
 ip 10.20.1.1 atm-vc 1 broadcast

Configuring the Frame Relay-Attached Router (Cisco 3640)

The following example demonstrates configuration for a 3640 that is Frame Relay-attached. This example uses a Cisco 3640 with an integrated channel service unit (CSU), which requires configuration of the controller information as well. If you are using an external channel service unit/data service unit (CSU/DSU) to a Cisco 2500-series router, for example, the controller configuration would not be required. 
 controller T1 2/0
   framing esf
   linecode b8zs
   channel-group 0 timeslots 4 speed 64


 interface Serial2/0:0
   ip address 10.20.1.1 255.255.255.0
   no ip mroute-cache
   encapsulation frame-relay IETF
   frame-relay map ip 10.20.1.3 100 broadcast

Related Information

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Updated: Jun 25, 2003Document ID: 15032